Overcome illegal characters [duplicate]

Url encode the | (pipe characters) in the href attribute (%7C):

<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Open+Sans:400,600,300,800,700,400italic%7CPT+Serif:400,400italic%7CBree+Serif">

https://stackoverflow.com/questions/22466913/google-fonts-url-break-html5-validation-on-w3-orgenter link description here

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